Electrical control system and PLC control system

1. Composition of electric control system through the study of the first chapter shows that any one electrical control system, is composed of input and output part and control part, as shown in figure 1. Figure 1 electric control system of which the input part is made up of a variety of input devices, such as buttons, position switch and sensor, etc; Control part is designed according to the control requirements, composed of several relay and contact which has the function of a certain logic control circuit; Output section is made up of all kinds of output devices, such as contactor, executive components such as solenoid valve, indicator light. Electrical control system is according to the instructions and signals of the object, and the control circuit according to the requirements of the deciding what to execute the order of the action or action, and then drive output device to achieve various operations. Due to various relay control circuit is to use hard wire and can be connected with the contact according to certain requirements, so the connection is complex and fault point, flexible and not easy to change. 2. The composition of PLC control system composed of PLC control system is also controlled by input, output, and three parts, as shown in figure 2. Figure 2, the composition of PLC control system can be seen from the diagram, PLC control system and electric control system of the input, output, part of the input, output, some basic same, but the control part is to use the programmable PLC controller, rather than the actual relay circuit. Therefore, PLC controller control system can be easily by changing the user program, in order to realize all kinds of control functions, fundamentally solves the electric control system control circuit is difficult to change. At the same time, PLC controller control system can not only realize logic operation, but also has the numerical calculation and process control of complex control functions.
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